SHEET /m/letrozole · PubChem CID 3902 · CAS 112809-51-5 · REV 2026.07
marquee
Letrozole
from sourceC17H11N5 · 285.3 g/mol
Femara · Letoval
What is Letrozole?
A breast cancer medicine sold as Femara. It blocks aromatase, the enzyme that makes estrogen in the body after menopause. from source
CategoryPrescription medicine
Chemical familyAromatics
LeaderboardsBiggest
Fig. 1 · 2D structure RDKit
SMILES
C1=CC(=CC=C1C#N)C(C2=CC=C(C=C2)C#N)N3C=NC=N3Where you'll find it
Dispensed on prescription, not sold on a shelf. See the rest of the prescription medicine group.
Toxicity & hazards
DangerIrritantHealth hazardH315, H319, H351, H360, H373from source